Isuzu KB P190. Manual — part 1164

7B1-50 MANUAL TRANSMISSION

Torque Specifications (Cont'd)

N

⋅⋅⋅⋅m (kgf⋅⋅⋅⋅m/lb⋅⋅⋅⋅ft)

RTW57BLF000301

MANUAL TRANSMISSION 7B1-51

TROUBLESHOOTING

1. ABNORMAL NOISE

1) NOISY IN NEUTRAL

Checkpoint

Trouble

Cause

Countermeasure

Replenish or replace the gear

oil

Insufficient or improper gear

oil

NG

Mainshaft splines

Synchronizer clutch hub

splines

Replace the main shaft and

the synchronizer clutch hub

Replace the gear(s)

Replace the flywheel pilot

Worn splines

Worn or scuffed gear tooth

contact surfaces

Flywheel pilot bearing

Worn flywheel pilot bearing

Bearings (Mainshaft,

countershaft, and transfer

shaft)

Gears (Mainshaft,

countershaft, reverse idler

gear and transfer gears)

Replace the bearing(s)

Worn or broken bearing(s)

OK

NG

NG

NG

NG

OK

OK

OK

Gear oil

Transmission

Realign the transmission

Transmission misalignment

OK

NG

7B1-52 MANUAL TRANSMISSION

2) NOISY OPERATION

Checkpoint

Trouble

Cause

Countermeasure

Replenish or replace the gear

oil

Insufficient or improper engine

oil

NG

Replace the gear(s)

Replace the gear(s)

Replace the bearing(s)

Gears (Gear whining)

Lack of backlash between

meshing gears

Free running gears seizing on

the thrust face or the inner

face

Bearings (Hissing, thumping

or bumping)

Worn or broken bearing(s)

Gears (Squealing at high

speeds)

Replace the gear(s)

Gears (Growling, humming, or

grinding)

Worn, chipped, or cracked

gear(s)

NG

NG

NG

NG

OK

OK

OK

OK

Gear oil (Metallic rattling)

MANUAL TRANSMISSION 7B1-53

2. HARD SHIFTING

Checkpoint

Trouble

Cause

Countermeasure

Change lever play

Clutch pedal free play

Repair or replace the

applicable parts and regrease

Readjust the clutch pedal free

play

Worn change lever sliding

portions

Improper clutch pedal free

play

Change lever operation

Repair or regrease the change

lever assembly

Replenish or replace the

engine oil

Hard operating change lever

caused insufficient grease

Insufficient or improper gear

oil

OK

OK

NG

NG

NG

NG

OK

OK

Gear oil

Continued on the next page

Shift rod and quadrant box

sliding faces, and other parts

Replace the shidt rod and/or

the quadrant box

Worn shift rod and/or sliding

faces

Repair or replace the sleeve

Sleeve movement failure

NG

NG

OK

Shift block sleeve movement